There are two groups of alexia.
The first or main group is "the central dyslexia" group which includes surface dyslexia, semantic dyslexia, phonological dyslexia, and deep dyslexia.
The second group, "the peripheral dyslexia" group, includes neglect dyslexia, attentional dyslexia, and pure alexia which is also known as alexia without agraphia.